Top rollers for spinning and preparatory machinery



Sept. 11, 1956 J, NQGUERA 2,762,083

TOP ROLLERS FOR SPINNING AND PREPARATORY MACHINERY Filed April 15, 1954 United States TOP ROLLERS FOR SPINNING AND PREPARATORY MACHINERY Joseph Noguera, Manchester, England, assignor to Casablancas High Draft Company Limited, Manchester, England, a British company This invention relates to top rollers for spinning and preparatory machinery, the rollers being of the kind having a spindle or arbor which carries a roller boss at or near each end.

To permit partial or complete dismantling of such rollers as normal maintenance operation, it has been proposed to make one or preferably both said bosses detachable from the arbor. To this end a detachable boss is conveniently provided with an axial bore, dimensioned to engage over the arbor as a loose working fit, and with internal spring means having arms which spring into a locating groove in the arbor, when the boss is correctly positioned thereon, so as to grip the arbor and resist withdrawal of the boss.

For various reasons it has, however, proved extremely difiicult to produce a spring means which will satisfactorily locate the boss on the arbor whilst at the same time ensuring that the boss can readily be withdrawn from the arbor, or operatively re-engaged thereon, when necessary. One such production difiiculty arises from the fact that the spring means cannot readily be constructed with the necessary accuracy since it has to be hardened and the hardening process inevitably produces some distortion. In addition, the spring means has to be made in such a way that its free size is larger than the recess in the boss in which it is received, so as to ensure that the spring means will be gripped within the recess, and for this reason the completed spring means has to be additionally distorted by compression for the purpose of inserting it into the boss recess. This addition-a1 distortion, together with that caused by hardening, makes it virtually impossible to ensure uniformity in the shape of the spring means and consequently in the action of the spring on the arbor. A further production difiiculty arises firom the fact that arms on the spring means, designed to grip the arbor on either side of the latter, have to be spaced conveniently to receive the arbor end therebetween when it is inserted into the roller boss. Spring arms which will correctly space themselves cannot, however, readily be achieved in view of the aforementioned constructional difiiculties and, owing to the very limited space available within the boss recess, it is also difiicult to produce a suitable spacing member which will ensure that the spring arms are held in the correct mutual position.

A main object of the present invention is to overcome the foregoing difiiculties and accordingly there is provided, for a top roller of the kind specified having a detachable roller boss axially bored to receive a central arbor, resilient coupling means composed of two separate spring members each having an outer and inner arm, said outer arms being shaped to press outwardly in opposite directions against an enlarged concentric seating vnthin the boss, whilst said inner arms form chords across the boss here between which the arbor can be gripped, said inner arms being initially spaced by mutual abutment to permit insertion of the arbor therebetween.

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According to a more limited aspect of the invention there is provided, in a top roller for textile machinery having a central arbor and an axially bored roller boss adapted for engagement over a peripherally grooved end of said arbor, resilient coupling means constituted by two separate spring members having outer arcuate arms arranged to seat, in opposed relationship under compression, within an enlarged concentric seating in the boss and inner substantially co-planar arms arranged to form chords across said boss bore which can seat in the arbor groove and grip the arbor therebetween, said inner arms being initially spaced by mutual abutment to permit insertion of the arbor end.

In order that the invention may be clearly understood and readily carried into effect one embodiment thereof will now be described in detail with reference to the accompanying drawings in which:

Figure 1 is a part-sectional end elevation of a detachable boss containing coupling means according to the invention,

Figure 2 is a view similar to Figure 1 showing the boss operatively positioned on an arbor end,

Figure 3 is a plan view showing an arbor end engaged by the coupling means shown in Figures 1 and 2,

Figure 4 is a detail view showing one spring member ofthe pair which constitutes the coupling means and,

Figure 5 is a side elevation of Figure 4.

Referring now to the drawings, a top roller for a spinning or preparatory machine has a central arbor 1 in the form of an elongated rod member of circular crosssection. Formed around the rod member 1, slightly inset from one end, is an annular groove 2 intended to cooperate with resilient coupling means located within a detachable roller boss 3 which fits over the grooved arbor end. For this purpose the boss 3 is provided with an axial bore 4 therethrough which is dimensioned to receive the grooved arbor end as a loose working fit.

At or near the outer end of the boss 3, the bore 4 therethrough is enlarged to provide a concentric seating recess 5 in which the coupling means is seated. This coupling means consists of two separate substantially identical spring members each of which has an arcuate 1 or semi-circular outer arm 6 formed on a slightly larger radius than the seating recess 5 within the boss. of the aforesaid semi-circular spring arms 6 is extended and returned inwardly at one end to provide an inner substantially co-planar arm 7 which has an approximately straight part contiguous with the outer arm and an ex tremity 7a which is bent over away from the outer arm.

The two spring members as described are intended to seat as shown in Figures 1 and 2 in diametrically opposed positions in the boss recess 5, the outer spring arms 6 being necessarily under slight compression when positioned in the recess. These arms 6 thus press outwardly in opposed directions against the boss seating. The spring members are entered in the boss seating 5 in relatively reverse positions so that the inner spring arms 7 t extend across the bore 4 through the boss from diametrically opposed points, the inner spring arms 7 thus forming cords across the circular section of the boss bore 4. The extremities 7a of the inner spring arms are dimensioned so that each will bear on the inner arm of the other spring member in a manner such that both inner arms 7 will be spaced apart by mutual abutment in approximately parallel relationship and under slight tension.

The mouth of the spring seating recess 5 in the end of the roller boss 5 may be closed by an annular sealing washer or by a cap and endpivot or in any other convenient manner, the closure employed, or part thereof,

serving to retain the springs in their correctseatin-g position in the recess.

Each

Whilst an arbor having a detachable boss at one end also be detachably retained inposition on the arbor by coupling meansv in accordance with the invention. Alternati ely the secondb'o'ss could be" a fixture on the arbor orma'y be detachably'secnred thereon" in any other known manner.

For purposes of assembly, a grooved: arborend is in? a sorted" through the' inner end of a roller b'o'ss bore 4 and the boss is' moved axially along the arbor until the annul'ar groove 2 near the end thereof is opposite the inner spring arms 7. In this posit-ion of the boss on the arbor, the inner spring arms will snap into the groove and the boss will thereby be firmly retained in position on the arbor. To obtain thissnapping action of the spring" arms 7 it will be appreciated that: these arms are forced slightly apart by the entry of the arbor end therebetween,

so that, the extremity 7aon each arm moves out of abutment with the other said arm.. The normal spacing of the arms; furthermore, with'the extremities 7a in their abutting positions, is less than the diameter of the groove base in the arbor end so that the arms 7 when located in the groove Will be under increased tension. In order to remove the boss 3 from the arbor, all that is necessary is to give the boss a sharp axial pull in relation to the arbor whereupon-the inner spring arms 7 will move apart out of thetarbor groove and permit the boss to be freely withdrawn. No difliculty will be experienced'in positioning the boss on the arbor since the inner spring arms will always be mutually spaced by an amount sufiioient to permit the arbor end to be pushed therebetween.

327,691 Jackson t Oct. 6, 1885' 861,912 Stiles July 30,v 1907 39 1,841,630

The inner end of the detachable boss 3 will-normally be positively located on the arbor in known manner against one end of an intermediate bearing sleeve whieh surrounds the arbor. The opposite end of this sleeve will similarly bear against the boss at the opposite arbor end which, as aforesaid, may be detachably mounted as described in the foregoing or in any other convenient manner, or may be av fixture on the arbor.

I claim:

In a top drafting roller for a textile machine the combi-nation' of an axially bored roller boss havingarl enlargedinternal annular seating around one endof said bore, two diametrically opposed sp'ri'ngmembers each having an outerarcnate arrrr engaging undercornpression in said sea-ting and an inner arm which forms a chord across said bo'ss bore" and is held-slightly flexed by the abutment of an inturned-i inner arm and against the other said inner arm and an arbor having a peripherally grooved 1 References Cited in the fileof this patent UNITED STATES PATENTS 

